As part of your search for the best cajon made in Europe please check out local cajon makers. There are so many choices! 28 cajon makers in Spain, 11 in Italy, 18 cajon builders in Poland, 8 in the UK. Locally made cajons contribute to your regional economy and provide an environmentally sound alternative to shipping a plywood box full of air halfway around the planet. Unfortunately many music stores and online stores only carry imported brands so you'll need to contact your local cajon builders directly. They can give you expert advice to help you get the best cajon for you.
Minimize the carbon footprint of your cajon purchase - buy direct from the cajon builder. Most imported cajons are shipped around the planet in big cargo ships. A locally made cajon helps your local economy and demonstrates that you are thinking about and support local artisans.
Cajons are one of the worlds most universal instruments. Drums speak to humans from the heart. Good cajons can be built by local woodwookers with simple tools even in remote areas. Listed above are links to the cajon drum builders of the world as retrieved by Internet searches from March 2018 to January 2020. I am sure there are many others not listed. Please send me updates and correction if you have additional information. Thanks.